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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee97ac6bd01378c0538c6ec961b1bed94277f0dbe71c1c86a54e833f001c2de' 
  AND token = 'RJz6T3SYNypO0Fq2SgQvRn8DnPaZ6//k4t3a/Mg2yR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}